In the Lazerette
Becky, I mounted our Wallas in the lazerette. The C-42 MkII has a shelf in each port & starboard lazerette. On these boats, the lazerette is large enough to crawl into and work. I built a L shaped bracket to hold the heater and mounted the bracket to the shelf. There was enough room above the shelf to get the heater high enough to remove the bottom cover for servicing without removing the whole heater. There was also a ready made vent right above the heater to supply good fresh air. We used the separate 10 liter day tank which is mounted right under the heater. What do they sound like? Well, there is a muted rush of air sound by the forced air blower and a very slight whistle or whir from the combustion fan. Outside the boat the whistle from the combustion fan is barely audible. These heaters are stepless... in other words, they throttle up and down depending on heat needs rather than switching on & off like other heaters. The noise level varies depending upon how much heat is being put out. Overall, they are very quiet. The stepless operation also means that these heaters are very miserly on power consumption since they only go through one startup cycle per use. Once the heater has ignited, the burner is self powered and the heater shuts the glow plug off. Only the fans & fuel pump draw power. Pic of heater in lazerette; http://img189.imageshack.us/img189/9798/wallas3000dx0xr.jpgPic of heater fuel tank; http://img269.imageshack.us/img269/916/wallasfueltank4df.jpgHope that helps,RodneyS/V SashaySF Bay